Details of two deadly attacks Friday in Norway quickly outpaced U.S. officials’ initial responses, which assumed the bombing in Oslo and a mass shooting at a youth camp outside the city were the work of a terrorist organization.

But by late Friday, police and government officials in the Scandinavian country were comparing the attacks to the 1995 bombing of a federal building in Oklahoma City — as the work of one of its own citizens, unrelated to Al Qaeda or any other terror movement.

The attacks have claimed nearly 100 lives, including an estimated 7 who died when a bomb explosion ripped through the main government building in downtown Oslo.

As many as 80 died on the island of Utøya, where the the suspected gunman — identifed as 32-year-old Anders Breivik — attacked a youth summer camp run by the country’s ruling political party.

“It seems it’s not Islamic-terror related,” a Norwegian official said, according to The Associated Press. “This seems like a madman’s work.”

The official said the attack “is probably more Norway’s Oklahoma City than it is Norway’s World Trade Center.”

But earlier in the day, just hours after the bomb exploded in Oslo and long before authorities there captured the alleged gunman, President Barack Obama had said the events in Norway are a reminder that stopping terrorism is a global responsibility.

“I wanted to personally extend my condolences to the people of Norway,” Obama said at the White House after meeting with New Zealand Prime Minister John Key. “It’s a reminder that the entire international community holds a stake in preventing this kind of terror from occurring. We have to work cooperatively together both on intelligence and in terms of prevention of these kinds of horrible attacks.”

The State Department issued a similar statement and said it had no reports that any Americans were hurt in either attack.

A police official said investigators believe “this is not linked to any international terrorist organizations at all.”

“It seems it’s not Islamic-terror related,” the official said. “This seems like a madman’s work.”

At a press conference late Friday night, a spokesperson for the Oslo police said that they had found undetonated explosives on the island, though he declined to specify the quantity or type of explosives.